v3.20.4
Goodwill (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Goodwill    
Goodwill (gross) $ 5,264.6 $ 5,211.2
Accumulated impairment losses (772.6) (772.6)
Goodwill 4,492.0 4,438.6
Currency translation adjustment 53.4  
Post Consumer Brands    
Goodwill    
Goodwill (gross) 2,012.0 2,011.8
Accumulated impairment losses (609.1) (609.1)
Goodwill 1,402.9 1,402.7
Currency translation adjustment 0.2  
Weetabix    
Goodwill    
Goodwill (gross) 942.7 889.5
Accumulated impairment losses 0.0 0.0
Goodwill 942.7 889.5
Currency translation adjustment 53.2  
Foodservice    
Goodwill    
Goodwill (gross) 1,335.6 1,335.6
Accumulated impairment losses 0.0 0.0
Goodwill 1,335.6 1,335.6
Currency translation adjustment 0.0  
Refrigerated Retail    
Goodwill    
Goodwill (gross) 793.6 793.6
Accumulated impairment losses (48.7) (48.7)
Goodwill 744.9 744.9
Currency translation adjustment 0.0  
BellRing Brands    
Goodwill    
Goodwill (gross) 180.7 180.7
Accumulated impairment losses (114.8) (114.8)
Goodwill 65.9 $ 65.9
Currency translation adjustment $ 0.0